Intermediate-mass stars and the origin of the gas-giant planet-metallicity correlation
arXiv:2501.19074 · doi:10.1051/0004-6361/202453328
Abstract
The number of known planets around intermediate-mass stars (1.5 M < M < 3.5 M) is rather low. We aim to test whether the correlation between the metallicity of the star and the presence of gas-giant planets found for MS low-mass stars still holds for intermediate-mass stars. In particular, we aim to understand whether or not the planet-metallicity relation changes as stars evolve from the pre-MS to the red giant branch. Our results confirm that pre-MS stars with transitional discs with gaps show lower metallicities than pre-MS with flat discs. We show a tendency of intermediate-mass stars in the MS to follow the gas-giant planet-metallicity correlation, although the differences in metal content between planet and non-planet hosts are rather modest and the strength of the correlation is significantly lower than for the less massive FGK MS stars. For stars in the red giant branch, we find a strong planet-metallicity correlation, compatible with that found for FGK MS stars. We discuss how the evolution of the mass in the convective zone of the star's interior might affect the measured metallicity of the star. The lack of a well-established planet-metallicity correlation in pre-MS and MS intermediate-mass stars can be explained by a scenario in which planet formation leads to an accretion of metal-poor material on the surface of the star. As intermediate-mass stars are mainly radiative the metallicity of the star does not reflect its bulk composition but the composition of the accreted material. When the star leaves the MS and develops a sizeable convective envelope, a strong-planet metallicity correlation is recovered. Thus, our results are in line with core-accretion models of planet formation and the idea that the planet-metallicity correlation reflects a bulk property of the star.
arXiv commentaccepted by Astronomy and Astrophysics
References in corpus (47)
- The chemical composition of the Sun
- Modules for Experiments in Stellar Astrophysics (MESA)
- Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
- Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
- Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
- Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
- The PLATO 2.0 Mission
- Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
- Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
- Defining and cataloging exoplanets: The exoplanet.eu database
- Modules for Experiments in Stellar Astrophysics (MESA): Time-Dependent Convection, Energy Conservation, Automatic Differentiation, and Infrastructure
- ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: towards an understanding of dust processing
- Gravitational Instabilities in Circumstellar Disks
- Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
- Extrasolar planet population synthesis IV. Correlations with disk metallicity, mass and lifetime
- The Orbital Evolution of Gas Giant Planets around Giant Stars
- Spectroscopic stellar parameters for 582 FGK stars in the HARPS volume-limited sample. Revising the metallicity-planet correlation
- Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity
- Exploring The Frequency Of Close-In Jovian Planets Around M Dwarfs
- Hot Jupiters and Cool Stars
- Migration and giant planet formation
- Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
- Images of Embedded Jovian Planet Formation At A Wide Separation Around AB Aurigae
- Fingerprints of giant planets in the photospheres of Herbig stars
- The accretion rates and mechanisms of Herbig Ae/Be stars
- On the formation time scale and core masses of gas giant planets
- Possible Stellar Metallicity Enhancements from the Accretion of Planets
- Kronos & Krios: Evidence for accretion of a massive, rocky planetary system in a comoving pair of solar-type stars
- The metallicity signature of evolved stars with planets
- Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and Gaia EDR3
- Spiral Arms in Disks: Planets or Gravitational Instability?
- Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
- HADES RV Programme with HARPS-N at TNG XII. The abundance signature of M dwarf stars with planets
- Evolution of protoplanetary disks from their taxonomy in scattered light: Group I vs. Group II
- Evolved stars and the origin of abundance trends in planet hosts
- Gravitational instability in a planet-forming disk
- Precise radial velocities of giant stars XVI. Planet occurrence rates from the combined analysis of the Lick, EXPRESS, and PPPS giant star surveys
- The mass and size of Herbig disks as seen by ALMA
- Revisiting the pre-main-sequence evolution of stars II. Consequences of planet formation on stellar surface composition
- Positive metallicity correlation for coreless giant planets
- Herbig Stars: A Quarter Century of Progress
- Stellar Photospheric Abundances as a Probe of Disks and Planets
- The Effect of Protoplanetary Disk Cooling Times on the Formation of Gas Giant Planets by Gravitational Instability
- Chemical analysis of early-type stars with planets
- Relation between metallicities and spectral energy distributions of Herbig Ae/Be stars. A potential link with planet formation
- Assessing the processes behind planet engulfment and its imprints
- Are Am stars and hot-Jupiter planets related?